CentOS Linux 7 [TuxCare] Security Update: grub2 / grub2-common / grub2-efi-ia32-cdboot / grub2-efi-x64 / etc Multiple Vulnerabilities (CENTOS7:CLSA-2025:1744724536)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
##

include('compat.inc');

if (description)
{
  script_id(361528);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/10/01");

  script_cve_id(
    "CVE-2024-45774",
    "CVE-2024-45775",
    "CVE-2024-45776",
    "CVE-2024-45777",
    "CVE-2024-45781",
    "CVE-2024-45783",
    "CVE-2024-56737",
    "CVE-2025-0690",
    "CVE-2025-1118",
    "CVE-2025-1125"
  );
  script_xref(name:"CLSA", value:"2025:1744724536");

  script_name(english:"CentOS Linux 7 [TuxCare] Security Update: grub2 / grub2-common / grub2-efi-ia32-cdboot / grub2-efi-x64 / etc Multiple Vulnerabilities (CENTOS7:CLSA-2025:1744724536)");

  script_set_attribute(attribute:"synopsis", value:
"The CentOS Linux host is missing one or more security updates.");
  script_set_attribute(attribute:"description", value:
"The CentOS Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the
TuxCare CENTOS7:CLSA-2025:1744724536 advisory.

  - A flaw was found in grub2. A specially crafted JPEG file can cause the JPEG parser of grub2 to incorrectly
    check the bounds of its internal buffers, resulting in an out-of-bounds write. The possibility of
    overwriting sensitive information to bypass secure boot protections is not discarded. (CVE-2024-45774)

  - A flaw was found in grub2 where the grub_extcmd_dispatcher() function calls grub_arg_list_alloc() to
    allocate memory for the grub's argument list. However, it fails to check in case the memory allocation
    fails. Once the allocation fails, a NULL point will be processed by the parse_option() function, leading
    grub to crash or, in some rare scenarios, corrupt the IVT data. (CVE-2024-45775)

  - When reading the language .mo file in grub_mofile_open(), grub2 fails to verify an integer overflow when
    allocating its internal buffer. A crafted .mo file may lead the buffer size calculation to overflow,
    leading to out-of-bound reads and writes. This flaw allows an attacker to leak sensitive data or overwrite
    critical data, possibly circumventing secure boot protections. (CVE-2024-45776)

  - A flaw was found in grub2. The calculation of the translation buffer when reading a language .mo file in
    grub_gettext_getstr_from_position() may overflow, leading to a Out-of-bound write. This issue can be
    leveraged by an attacker to overwrite grub2's sensitive heap data, eventually leading to the circumvention
    of secure boot protections. (CVE-2024-45777)

  - A flaw was found in grub2. When reading a symbolic link's name from a UFS filesystem, grub2 fails to
    validate the string length taken as an input. The lack of validation may lead to a heap out-of-bounds
    write, causing data integrity issues and eventually allowing an attacker to circumvent secure boot
    protections. (CVE-2024-45781)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version
number.");
  # https://security.tuxcare.com/csaf/v2/els_os/centos7els/advisories/2025/clsa-2025_1744724536.json
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?9f439249");
  script_set_attribute(attribute:"see_also", value:"https://cve.tuxcare.com/els/releases/CLSA-2025:1744724536");
  script_set_attribute(attribute:"solution", value:
"Update the affected packages based on the guidance in TuxCare advisory CENTOS7:CLSA-2025:1744724536.");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:N/C:C/I:C/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2025-1125");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");
  script_set_attribute(attribute:"vendor_severity", value:"Important");

  script_set_attribute(attribute:"vuln_publication_date", value:"2024/04/11");
  script_set_attribute(attribute:"patch_publication_date", value:"2025/04/15");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/10/01");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"CentOS Local Security Checks");

  script_copyright(english:"This script is Copyright (C) 2026 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("ssh_get_info2.nasl");
  script_require_keys("Host/OS/extended-third-party", "Host/local_checks_enabled", "Host/CentOS/release", "Host/CentOS/rpm-list");

  exit(0);
}
include('rpm2.inc');

var third_party_support = get_kb_item('Host/OS/extended-third-party');
if (empty_or_null(third_party_support) || third_party_support != 'TuxCare') exit(0, 'TuxCare support not enabled.');

if (!get_kb_item('Host/local_checks_enabled')) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
var os_product = get_kb_item('installed_os/local/SSH/0/product');
if (isnull(os_product) || 'CentOS Linux' >!< os_product) audit(AUDIT_OS_NOT, 'CentOS Linux');
var os_version = get_kb_item('installed_os/local/SSH/0/version');
if (isnull(os_version)) audit(AUDIT_UNKNOWN_APP_VER, 'CentOS Linux');
if (! preg(pattern:"^7([^0-9]|$)", string:os_version)) audit(AUDIT_OS_NOT, 'CentOS Linux 7', 'CentOS Linux ' + os_version);

if (!get_kb_item('Host/CentOS/rpm-list')) audit(AUDIT_PACKAGE_LIST_MISSING);

var cpu = get_kb_item('Host/cpu');
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if ('x86_64' >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'CentOS Linux', cpu);


var constraints = [
  {
    'release': '7',
    'pkgs': [
      {'reference':'grub2-2.02-0.87.0.2.el7.centos.14.tuxcare.els6', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE, 'epoch':'3'},
      {'reference':'grub2-common-2.02-0.87.0.2.el7.centos.14.tuxcare.els6', 'rpm_spec_vers_cmp':TRUE, 'epoch':'3'},
      {'reference':'grub2-efi-ia32-cdboot-2.02-0.87.0.2.el7.centos.14.tuxcare.els6', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE, 'epoch':'3'},
      {'reference':'grub2-efi-x64-2.02-0.87.0.2.el7.centos.14.tuxcare.els6', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE, 'epoch':'3'},
      {'reference':'grub2-efi-x64-cdboot-2.02-0.87.0.2.el7.centos.14.tuxcare.els6', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE, 'epoch':'3'},
      {'reference':'grub2-i386-modules-2.02-0.87.0.2.el7.centos.14.tuxcare.els6', 'rpm_spec_vers_cmp':TRUE, 'epoch':'3'},
      {'reference':'grub2-pc-2.02-0.87.0.2.el7.centos.14.tuxcare.els6', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE, 'epoch':'3'},
      {'reference':'grub2-pc-modules-2.02-0.87.0.2.el7.centos.14.tuxcare.els6', 'rpm_spec_vers_cmp':TRUE, 'epoch':'3'},
      {'reference':'grub2-tools-2.02-0.87.0.2.el7.centos.14.tuxcare.els6', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE, 'epoch':'3'},
      {'reference':'grub2-tools-extra-2.02-0.87.0.2.el7.centos.14.tuxcare.els6', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE, 'epoch':'3'}
    ]
  }
];

var os_release = get_one_kb_item('installed_os/local/SSH/0/release');
var os_sp = get_one_kb_item('Host/*/minor_release');

var flag = 0;
var reference;
var sp;
var _cpu;
var el_string;
var rpm_spec_vers_cmp;
var epoch;
var allowmaj;
var exists_check;
var cves;
foreach var constraint ( constraints ) {
  # Check that the target release is equal to the affected release
  if (!empty_or_null(constraint['release'])){
    if (constraint['release'] != os_release) continue;
  }
  if (!empty_or_null(constraint['sp'])){
    if (constraint['sp'] != os_sp) continue;
  }
  foreach var pkg ( constraint['pkgs'] ) {
    reference = NULL;
    sp = NULL;
    _cpu = NULL;
    el_string = NULL;
    rpm_spec_vers_cmp = NULL;
    epoch = NULL;
    allowmaj = NULL;
    exists_check = NULL;
    cves = NULL;
    if (!empty_or_null(pkg['reference'])) reference = pkg['reference'];
    if (!empty_or_null(pkg['sp'])) sp = pkg['sp'];
    if (!empty_or_null(pkg['cpu'])) _cpu = pkg['cpu'];
    if (!empty_or_null(pkg['el_string'])) el_string = pkg['el_string'];
    if (!empty_or_null(pkg['rpm_spec_vers_cmp'])) rpm_spec_vers_cmp = pkg['rpm_spec_vers_cmp'];
    if (!empty_or_null(pkg['epoch'])) epoch = pkg['epoch'];
    if (!empty_or_null(pkg['allowmaj'])) allowmaj = pkg['allowmaj'];
    if (!empty_or_null(pkg['exists_check'])) exists_check = pkg['exists_check'];
    if (!empty_or_null(pkg['cves'])) cves = pkg['cves'];
    if (reference &&
        ## (no known rpm to check OR known rpm_exists)
        (!exists_check || rpm_exists(rpm:exists_check)) &&
        rpm_check(sp:sp, cpu:_cpu, reference:reference, epoch:epoch, el_string:el_string, rpm_spec_vers_cmp:rpm_spec_vers_cmp, allowmaj:allowmaj, cves:cves)) flag++;
  }
}


if (flag)
{
  security_report_v4(
      port       : 0,
      severity   : SECURITY_HOLE,
      extra      : rpm_report_get()
  );
  exit(0);
}
else
{
  var tested = pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, 'grub2 / grub2-common / grub2-efi-ia32-cdboot / grub2-efi-x64 / etc');
}